diff --git a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/Substr.java b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/Substr.java
index 4ffe3ef8a..480d8bfef 100644
--- a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/Substr.java
+++ b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/main/java/org/apache/geaflow/dsl/udf/table/string/Substr.java
@@ -31,6 +31,9 @@ public String eval(String str, Integer pos, Integer length) {
         if (str == null || pos == null || length == null) {
             return null;
         }
+        if (pos == Integer.MIN_VALUE) {
+            return str;
+        }
         if ((Math.abs(pos) > str.length())) {
             return str;
         }
@@ -64,6 +67,9 @@ public BinaryString eval(BinaryString str, Integer pos, Integer length) {
         if (str == null || pos == null || length == null) {
             return null;
         }
+        if (pos == Integer.MIN_VALUE) {
+            return null;
+        }
         if (Math.abs(pos) > str.getLength()) {
             return null;
         }
diff --git a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/test/java/org/apache/geaflow/dsl/udf/string/SubstrTest.java b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/test/java/org/apache/geaflow/dsl/udf/string/SubstrTest.java
index ec37db6c7..eaee520d0 100644
--- a/geaflow/geaflow-dsl/geaflow-dsl-plan/src/test/java/org/apache/geaflow/dsl/udf/string/SubstrTest.java
+++ b/geaflow/geaflow-dsl/geaflow-dsl-plan/src/test/java/org/apache/geaflow/dsl/udf/string/SubstrTest.java
@@ -43,4 +43,17 @@ public void test() {
         Assert.assertEquals(sb.eval(BinaryString.fromString("Facebook"), -5).toString(), "ebook");
         Assert.assertEquals(sb.eval(BinaryString.fromString("Facebook"), 5, 1).toString(), "b");
     }
+
+    @Test
+    public void testIntegerMinValue() {
+        Substr sb = new Substr();
+
+        // Test Integer.MIN_VALUE for String version
+        Assert.assertEquals(sb.eval("hello", Integer.MIN_VALUE, 1), "hello");
+        Assert.assertEquals(sb.eval("hello", Integer.MIN_VALUE), "hello");
+
+        // Test Integer.MIN_VALUE for BinaryString version
+        Assert.assertNull(sb.eval(BinaryString.fromString("hello"), Integer.MIN_VALUE, 1));
+        Assert.assertNull(sb.eval(BinaryString.fromString("hello"), Integer.MIN_VALUE));
+    }
 }